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Background 3, 3diindolylmethane (DIM), a natural phytochemical, has shown inhibitory effects on the growth and migration of a variety of cancer cells; however, whether DIM has similar effects on vascular smooth muscle cells (VSMCs) remains unknown. and activators of transcription 3 (STAT3). Our in vivo studies using a mouse carotid arterial injury model revealed that treatment with 150 mg/kg DIM resulted in significant reduction of the neointima/media ratio and proliferating cell nuclear antigen (PCNA)-positive cells, without affecting apoptosis of vascular cells and reendothelialization. Infiltration of inflammatory cells was also inhibited by DIM administration. Conclusion These results demonstrate that DIM can suppress the phenotypic modulation of VSMCs and neointima hyperplasia after vascular injury. These beneficial effects on VSMCs were at least partly mediated by the inhibition of PDGF-R and the activities of downstream signaling pathways. The results suggest that DIM has the potential to be a candidate for the prevention of restenosis. Introduction Atherosclerosis is the Rabbit Polyclonal to IPPK primary buy 549505-65-9 pathological event leading to decreases in arterial lumen size. The thrombotic complications of atherosclerosis, such as myocardial infarction and stroke, are the leading causes of death in both middle- and high-income countries and are among the top five causes of death in low-income countries [1]. Great efforts have been made to find efficient therapies to overcome atherosclerotic obstructive disease. Percutaneous coronary intervention (PCI), which has advanced over the past decades, can restore blood flow in these vessels. Nevertheless, restenosis of the artery following PCI is the major factor hampering the long-term success of the procedure. Drug eluting stents (DES) can reduce the restenosis rate to less than 10% [2], [3]; however, emerging evidence suggests that DES has the potential drawback of impairing reendothelialization and increasing the risk of late thrombosis [4], [5]. These drawbacks have prompted the search for new compounds that can efficiently inhibit restenosis with fewer side effects. Neointima formation is a crucial process in restenosis. During neointima development after vascular injury, growth and prothrombotic factors released from platelets and leucocytes trigger the migration of vascular smooth muscle cells (VSMCs) buy 549505-65-9 from the media to the intima, where they proliferate and undergo phenotypic changes. Excessive VSMC proliferation, migration and phenotypic modulation underlie the major pathophysiologic mechanism responsible for the failure of restenosis after PCI [6], [7]. Therefore, inhibiting VSMC proliferation, migration and phenotypic modulation may provide useful approaches to improve existing therapeutic strategies for restenosis. Epidemiological studies have shown that increased consumption of vegetables and fruits is associated with a lower risk of all-cause, cancer, and cardiovascular disease death [8], [9]. Phytochemicals harvested from vegetables and fruits have received increasing attention recently, and the use of phytochemicals in combination therapies has been considered as one of several novel treatment approaches. One of the most buy 549505-65-9 promising bioactive phytochemicals is indole-3-carbinol (I3C), which is produced from cruciferous vegetables, such as cauliflower and broccoli. In the acidic environment of the stomach, I3C is susceptible to oligomerization and converted into a number of condensation products, including a dimeric product, 3,3diindolylmethane (DIM), its major active metabolite [10]. DIM has shown inhibitory effects on the growth of a variety of cancer cells, including breast, prostate, thyroid, buy 549505-65-9 lung, and cervical cancers, with negligible levels of toxicity [11]C[15]. The molecular mechanism by which DIM confers its biological effects has been extensively investigated. It is becoming clear that DIM has pleiotropic effects on multiple signaling targets related to control of the cell cycle, apoptosis, signal transduction, oncogenesis, hormonal homeostasis, and transcription regulation. In vitro studies have indicated that DIM is a potent inhibitor of complexes of cyclin and cyclin-dependent kinases (CDKs) and is responsible for upregulation of CDK inhibitors. DIM also participates in the regulation of Akt signal transduction. Inhibition of the activation of Akt and its downstream effector, NF-B, has been reported in prostate cancer cells [11]. Moreover, DIM has been shown to regulate Akt/FOXO3a/androgen receptor signaling, resulting in the alteration of p27Kip1 expression [16]. In addition to these antiproliferative effects, DIM inhibits angiogenesis and invasion of tumor cells by repressing the expression of matrix metalloproteinase, adhesion molecules and urokinase-type plasminogen activator [13], [17]. buy 549505-65-9 However, whether DIM has a direct effect on VSMC proliferation and migration, in addition to its anticancer properties, remains unknown. In addition, the suitability of DIM for avoiding highly proliferative vascular reactions, such as postangioplasty restenosis, demands further investigation. In the present study, we demonstrate that DIM causes insufficient legislation of the cell.